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The other man is black, 20 to 22 years old, 5ft 9in and skinny. He was clean shaven and wore a black hoodie and grey or black tracksuit bottoms. He was riding a black mountain bike with white writing on the frame.

PC Tim Phillips from Derbyshire police is leading a public appeal for help solve the case, which happened between 7.50pm and 8.30pm on August 19, and wants to track down the attackers.

He said: “This was a rare but terrifying incident for the victim, where he was approached by two unknown males, one of whom threatened him with a knife.

“I would like to appeal to anyone who was in Arboretum Park witnessing this incident or has any information relating to the identities of those involved.”

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PC Phillips said there was another event nearby which he believed was linked to the case.

He said: “Around the same time and also in Arboretum Park, we believe a different male approached two male bystanders asking them to ring the police on his behalf because he had been chased by someone with a knife.

“I believe these two incidents to be linked and would like to encourage this person to come forward to the police. Their report will be taken seriously and thoroughly investigated, as will any incident involving a knife.”